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The sunflower is an annual plant grown as a crop for its edible oil and edible fruits (commonly called "sunflower seeds"). Sunflower is also used as bird food, as livestock forage (as a meal or a silage plant) and in some industrial applications. The plant was first domesticated in the Americas. Wild Helianthus annuus is a widely branched annual plant with many flower heads. The domestic sunflower, however, possesses a single large inflorescence (flower head) atop an unbranched stem. The name sunflower derives from the flower head's shape, which resembles the Sun.  Source